Spatial-temporal differentiation characteristics of urban heat island in Wuhan City based on local climate zone
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1.Wuhan Public Meteorological Service Center, Wuhan 430040, China;2.College of Horticulture & Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China

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P463.3

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    Abstract:

    The air temperature in the central urban area of Wuhan City was observed based on the local climate zone (LCZ) scheme to accurately evaluate the spatial-temporal differentiation characteristics of urban heat island (UHI) in Wuhan City and assist in the design of climate adaptability. The spatial-temporal variation of urban heat island intensity (UHII) in six types of architectural spaces and three types of natural spaces during three consecutive summer and winterperiods were analyzed. Explored the daily average UHII differences, hourly UHII variation, and UHII differences within the same LCZ type among different LCZ types, as well as their influencing factors were investigated. The results showed that each LCZ maintained stable daily average inter-type differences of UHII in summer and winter. The LCZ type with more high-rise building had a higher UHII, especially the open high-rise (LCZ 4) and open mid-rise (LCZ 5). However, sparse forests (LCZ B), dense forests (LCZ A), open low-rise (LCZ 6), and scattered buildings (LCZ 9) remained below 0 ℃ in general. There was a significant difference in the hourly variation of UHII between LCZ A and other LCZ types. LCZ A showed a rapid increase followed by a decrease within 8 hours after sunrise, while other LCZ types showed a rapid decrease followed by a stable increase. Within a single day, the UHII of each LCZ exhibited a characteristic of “strong in summer and weak in winter, weak in day and strong at night”. LCZ 9 and LCZ A were able to maintain the urban cold island effect for a long time to alleviate local heat environment, while LCZ 4 was the only type maintaining UHII above 0 ℃ in both summer and winter. Both LCZ 2 and LCZ 5 with mid-rise characteristics exhibited significant intra-type UHII differences. Similar LCZ plots located in the central part of the urban area were affected by the obstruction of urban canopy ventilation, and their UHII was higher than those on the urban boundary plots. The results indicated that UHII difference among LCZs were stable in summer and winter, while intra-class significant differences of the same LCZ were mainly driven by the spatial structure of Wuhan City, with densely urban core area being more prone to localized high temperatures due to poor ventilation performance and frequent anthropogenic heat emissions.

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刘火胜,李思韬,宛浩凯,余乾慧,吴昌广. Spatial-temporal differentiation characteristics of urban heat island in Wuhan City based on local climate zone[J]. Jorunal of Huazhong Agricultural University,2023,42(4):98-106.

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History
  • Received:February 14,2023
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  • Online: August 30,2023
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